Pulse or digital communications – Testing
Reexamination Certificate
2005-03-15
2005-03-15
Ghebretinsae, Temesghen (Department: 2637)
Pulse or digital communications
Testing
C375S225000, C375S355000
Reexamination Certificate
active
06868120
ABSTRACT:
A system and method for measuring the Ricean K-factor of a wireless channel in real time are provided. An amplitude sample of a transmitted RE waveform of either fixed or varying amplitude is low-pass filtered to eliminate high frequency noise if present. The magnitude squared of the filtered sample amplitude is squared to obtain the power gain of the sample and the magnitude squared of the power gain is computed. The sums of a window of power gains and the sum of the squares of the power gains are then updated. These sums of the window of amplitude samples are then averaged to estimate the first and second moments of the window of samples. The averages are low-pass filtered to minimize fluctuations. The final average is input to a moment-based set of Greenstein-Michelson-Erceg (GME) equations to obtain estimates for the time average of the power gain and rms deviation of the power gain. The K-factor is calculated in accordance with these equations and low-pass filtered to smooth the result.
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Gormley Eamonn
Rodriguez-Sanchez Jose
Clearwire Corporation
Davis , Wright, Tremaine, LLP
Donohue Michael J.
Ghebretinsae Temesghen
Ghulamali Qutub
LandOfFree
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